At 298 K an ionic solid has a lattice energy of +802 kJ·mol⁻¹
CHEMISTRY · Subjective · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry
Problem
At 298 K an ionic solid has a lattice energy of +802 kJ·mol⁻¹, a hydration enthalpy of −835 kJ·mol⁻¹, and an entropy change on dissolution of +134 J·mol⁻¹·K⁻¹. Calculate the standard free energy change, ΔG°, for dissolving 1 mol of this solid at 298 K. Report your answer in kJ·mol⁻¹ to three significant figures.